Standard finish for face of flanges (ANSI B16.5)

STOCK FINISH:

The most widely used of any gasket, finish, because, practiaily, is suitable for all ordinary service conditions . This is a continuous spiral groove . Flanges sizes 12” (304.8mm) and smaller , are produced with a 1/16” round-nosed tool at a feed of 1/32” per revolution . For sizes 14” (33506mm) and larger . the finish is made 1/8” round-nosed tool at a feed of 3/64” per revolution .

SPIRAL SERRATED OR PHONOGRAPHIC :

This finish is produced by using a 90ºround-noise tool .

CONCENTRIC SERRATED :

This finish a produced by using a 90º round-noise tool . SMOOTH FINISH : The cutting tool employed shall have an approximate 0.06” radius .

The resultant surface finish shall have a 125µ inch to 250µ inch (ANSI B16.5 para 6.4;4.1)

1. RAISED FACE , AND LARGE MALE AND FEMALE

 Either a serrated-concentric or serrated-spiral finish having from 34 to 64 grooves per inch is used .

 The cutting tool employed has an approximate 0.06 in . Radius . The resultant surface finish shall have a125inch(3.2µm) . to 500µ inch (12.5µ m) approximate roughness .

2. TNGUE AND GROOVE . AND SMALL MAKE AND FEMALE

  The gasket contact surface does not exceed 125µ in .(3.2µ m) roughness .

3. RING IOINP

   The inside wall surface of gasket groove does not exceed 63µ in (1.6µ m) roughness .

4. BLIND

   Blind flanges need not be faced in the center if , when this center part is raised . Its diameter is at least 1 in .

   Smaller than the inside diameter of fittings of the corresponding pressure class . when the centen part is depressed Its diameter is not greater than the inside diameter of the corresponding pressure class fittings .

   Machining of the depressed center is not required .